Its black and kind of hard to tell if its mold. I removed the carpet from a pre-owned home and found these black marks on the bedroom's hardwood floor. More examples are at WOOD FLOOR DAMAGE REPAIR That looks like a prior spill or a pet urine stain. These questions & answers about diagnosing the cause of stains on carpets and on stain removal were posted originally at CARPET STAIN DIAGNOSIS - be sure to review that article Stains & Marks on Carpeting - Diagnostic FAQs We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. This article series describes how to identify and diagnose carpeting stains at the edge of carpets near walls in buildingsįocusing on the cause of various interior wall and ceiling stains and explains how to recognize thermal tracking, thermal bridging stains,īuilding air leaks, and building insulation defects. Why light spots, bleach spots, or dark spots or other colors show up as stains or discoloration or loss of pigment on rugs and carpets. We have no relationship with advertisers, products, or services discussed at this website.Ĭarpet stain diagnosis questions & answers:įAQs about how to determine the cause of various types of stains and stain patterns found on carpets and rugs. When you think about it, there are dozens of situations where you could put this phenomenon to work.InspectAPedia tolerates no conflicts of interest. Most of these uses, as well as dozens of others, follow a common theme - the black lights make the invisible visible or isolate one specific substance from everything around it. Black lights can also identify semen and other bodily fluids that naturally fluoresce. This makes it easier to pick the fingerprints out from surrounding dirt. To pick out fingerprints, for example, they often dust with fluorescent dye under a black light. * Forensic scientists use them to analyze crime scenes. * Amusement parks and clubs use them to identify invisible fluorescent hand stamps for readmission. The United States and many other countries include an invisible fluorescent strip in their larger bills that only shows up under a black light. * Law enforcement officers can use them to identify counterfeit money. For example, they might detect an invisible air conditioner leak by adding fluorescent dye to the refrigerant.īlack lights can be used to detect counterfeit bills. * Repairmen use them to find invisible leaks in machinery - they inject a little fluorescent dye into the fuel supply and illuminate it with a black light. Many paints today contain phosphors that will glow under a black light, while most older paints do not contain phosphors. * Appraisers use them to detect forgeries of antiques. In addition to making people and fluorescent posters look cool, black lights have some practical applications. You can also buy fluorescent black light bubbles, invisible black light ink, fluorescent black light carpet and even fluorescent black light hair gel. Clubs and amusement parks use special black light paint that glows different colors. Most fluorescent colored things, such as highlighters, contain phosphors, and you'll find them in all glow-in-the-dark products. There also a lot of phosphors in manmade material, including television screens and some paints, fabric and plastics. There are lots of natural phosphors, in your teeth and fingernails, among other things. If you walked around all night with a portable black light, you would discover that there are phosphors all over the place.
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